KTV Room Sound System Layout: A Room-by-Room Guide
How to lay out speakers, subs and microphones in small, medium and large KTV rooms, including the feedback problems that show up in every private room.
KTV rooms are a different acoustic problem from bars. The room is small, the singer stands close to the speakers, and the same microphone is used by a shouty group and a whispery one within the same hour. Layout matters more than raw power.
Small rooms: 15-25 square metres
Two 10-inch or 12-inch full-range cabinets, wall-mounted at 1.8-2.2 metres, angled slightly toward the seating area. One 12-inch or 15-inch subwoofer in a corner is usually enough, and often too much: start with the sub at 30% gain and raise it only if the room feels thin.
A compact digital mixer with presets per room type saves staff time. We list a Yamaha DM3 that fits on a shelf and stores scenes for different room sizes.
Medium rooms: 25-45 square metres
Four cabinets, two front and two rear, with the rear pair delayed by a few milliseconds to keep the image at the front. One or two 15-inch subs. This is where feedback starts to appear, because the rear speakers are close to the microphones.
Large rooms: 45-80 square metres
A small line array or four point-source tops plus two 18-inch subs. Add a processor for crossover, EQ and limiting. Keep the microphones behind the plane of the front speakers and use cardioid subs if the room shares a wall with a neighbour.
Feedback is a layout problem
Before buying a feedback destroyer, change the layout: move the speakers forward, angle them across the seating area rather than at the microphone position, and lower the gain on the monitors. Ninety percent of KTV feedback is a speaker aimed at a microphone.
Microphone choices that survive KTV
Dynamic cardioid mics are the right tool. They reject the room, handle close singing and survive drops. Condensers sound more detailed but pick up everything, including the air conditioner. A bulk lot of used Shure SM58 mics is the practical choice for a multi-room venue.
The preset habit
Store one scene per room type and label the console clearly. Staff turnover in KTV venues is high, and a system that needs a trained engineer every weekend will drift out of tune within a month.
For rooms where appearance matters, grade B Electro-Voice ETX-35P cabinets are a good compromise between cost and looks.